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Phantom rebuild F450 YAW problem (SOLVED)

Discussion in 'Phantom 1 Discussion' started by OEKA, Feb 1, 2015.

  1. OEKA

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    Hi.

    just had to rebuild my fc40 yesterday. I used all the original parts, exept from a SBEC/LED module.

    Works at first try, but i keep slowly spinning to the right :/ I have done compass dance, naza basic and advanced calibration, still slowly turns to the right. Have just tested in ATTI mode and inside, snowy outside :/

    Any idea of what might cause this? Is this a compass problem? Settings in NAZA (gps position is ok)

    The build.
    [​IMG]

    Compass placement
    [​IMG]

    Compass from behind (to the right with black tape on it)
    [​IMG]
     
  2. aartsf

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    Re: Phantom rebuild F450 YAW problem

    Looking at your build, it doesn't seem to be evenly balanced,.....does it?
     
  3. OEKA

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    Re: Phantom rebuild F450 YAW problem

    hmm.. Might be. How do you recon i should balance it?
     
  4. aartsf

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    Re: Phantom rebuild F450 YAW problem

    The most practical way seems to be using a weighing-sale that is precise enough to weigh at leat upto grams. Now you can weigh each branch of your bird under the motor-area. The 4 measurement should be the same. If not you can correct to the balance that is needed by adding some weight at location(s)/ branch(es) as needed.
     
  5. syotr

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    Re: Phantom rebuild F450 YAW problem

    Balance can be pretty far off and the NAZA will correct for it. My guess is a motor not level. Check that you do not have an arm twisted.
     
  6. OEKA

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    Re: Phantom rebuild F450 YAW problem

    Thanks for the replies!

    I am really scratching my head over this.. :/ I will buy a scale so i can measure each branch. I have now moved the gps unit to the front and in the middle. Tried a test flight last night, still spinning i ATTI mode and it went apeshit i GPS mode.. Not cool, since the gps mounting should have been correctly inputed in the naza.

    It is the gps unit, not the compass i am typing in the mounting post in naza software right?

    All motors seems to be level.. Dont know how to test it, but by eye all seems to be firm and leveled.. Still, would apreciate any feedback i can get.

    Edit: Test flight right now. Quad flew nice, but still a small YAW to the right, and also a small ROLL to the right. This in both GPS mode and ATTI. Weight issue??

    Thanks
     
  7. syotr

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    Re: Phantom rebuild F450 YAW problem

    Double check that you have the compass mounted in the correct orientation as it was in the FC 40.
    The GPS should not be close to the battery wires. You may want to try some foil shielding underneath it.
    Check in the assistant software that the compass value is within the recommended range.
    I still think your problem could be motors out of level. Get a small bubble level. Set a wrench socket down over the motor shaft so that it rests on the flat part of the motor bell. Place the bubble level on top. Twist the arms as needed to level. Apply heat if necessary.
     
  8. OEKA

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    Re: Phantom rebuild F450 YAW problem

    Thank you for your response.

    I have checked all the things you mentioned, and just checked the angel of the arms now. All arms seems crooked.. :/ I twisted them a bit, after using a (large) bubble level, and the YAW drift seems much better. Not sure if all drift (ROLL) is gone, but progress!

    This is the punishment for buying a cheap 450 frame, not the DJI original one.. :p

    http://www.ebay.com/itm/271311015417?_t ... EBIDX%3AIT

    Thanks alot, all of you. This might just work ;)
     
  9. SanCap

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    Re: Phantom rebuild F450 YAW problem

    Did you calibrate the sticks?
     

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  10. OEKA

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    Re: Phantom rebuild F450 YAW problem

    I have done it all..

    But after some bending the quad flies almost 100% smooth. :D The 450 frame was not straight. This i found out after i have done everything else. I used a bubble level and after a test flight i am very happy! The quad seems some stabile and responsive after i swapped the phantom 1 frame to the 450 frame.

    SOLVED! :D

    Anyway, thanks for all the help guys. Really appreciate it!

    Oyvind
     
  11. syotr

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    Glad you got it sorted out.
    Here is how I level mine:
     

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  12. aartsf

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    Congratulations and happy flying